linux-kernel - Re: [PATCH v4 04/15] mm: pgtable: add statistics for P4D level page table

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Message-ID: <77c202bf-e0a3-45e7-bf8d-eef7903e3c64@bytedance.com>
Date: Fri, 3 Jan 2025 11:53:56 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: Kevin Brodsky <kevin.brodsky@....com>
Cc: peterz@...radead.org, agordeev@...ux.ibm.com, palmer@...belt.com,
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Subject: Re: [PATCH v4 04/15] mm: pgtable: add statistics for P4D level page
 table



On 2025/1/3 00:53, Kevin Brodsky wrote:
> On 30/12/2024 10:07, Qi Zheng wrote:
>> diff --git a/arch/riscv/include/asm/pgalloc.h b/arch/riscv/include/asm/pgalloc.h
>> index 551d614d3369c..3466fbe2e508d 100644
>> --- a/arch/riscv/include/asm/pgalloc.h
>> +++ b/arch/riscv/include/asm/pgalloc.h
>> @@ -108,8 +108,12 @@ static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
>>   static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d,
>>   				  unsigned long addr)
>>   {
>> -	if (pgtable_l5_enabled)
>> +	if (pgtable_l5_enabled) {
>> +		struct ptdesc *ptdesc = virt_to_ptdesc(p4d);
>> +
>> +		pagetable_p4d_dtor(ptdesc);
>>   		riscv_tlb_remove_ptdesc(tlb, virt_to_ptdesc(p4d));
> 
> Nit: could use the new ptdesc variable here instead of calling
> virt_to_ptdesc().

Right, but we will remove pagetable_p4d_dtor() in patch #10, so this
may not matter.

Thanks!

> 
> - Kevin